| Autor: |
Dubey, B. L., Tiwari, B. N., Ojha, P. N., Tripathi, Awadhesh |
| Zdroj: |
Journal of Materials Science; May 1985, Vol. 20 Issue: 5 p1631-1636, 6p |
| Abstrakt: |
The electrical conductivity (s) and thermoelectric power (S) for the system La1-xNdxTlO3 (0 ?x? 1.0) in the temperature range 295 to 805 K are reported. Both logs andS as a function ofT have been found to be linear with a break in the slope around a specific temperature,TB. The break temperature systematically decreases as we proceed from the systemx=0 tox=1.0. It has been concluded that conduction belowTB is extrinsic and takes place owing to hopping of electrons localized on the defect centre Tl2+ to Tl3+ on normal sites. Conduction aboveTB is the normal band type in all systems. The energy band gap has been evaluated in all cases and it has been found that it decreases systematically fromx=0 tox=1.0. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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